I see, in that case, you may want to try the following steps:
Check if the microphone is enabled in the Bluetooth settings:
- Press Windows key + I to open the Settings app.
- Go to "Devices" > "Bluetooth & other devices".
- Click on your Bluetooth headset and then click on "Device properties".
- Make sure the "Input" option is turned on.
Also, Check if the microphone is enabled in the privacy settings:
- Press Windows key + I to open the Settings app.
- Go to "Privacy" > "Microphone".
- Make sure the "Allow apps to access your microphone" option is turned on.
I hope this helps :) Let me know the results :)